﻿// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

#nullable disable

using System.ComponentModel;
using System.Drawing;
using System.Windows.Forms.Layout;
using System.Windows.Forms.TestUtilities;
using Moq;
using Point = System.Drawing.Point;
using Size = System.Drawing.Size;

namespace System.Windows.Forms.Tests;

public class UserControlTests
{
    [WinFormsFact]
    public void UserControl_Ctor_Default()
    {
        using SubUserControl control = new();
        Assert.Null(control.AccessibleDefaultActionDescription);
        Assert.Null(control.AccessibleDescription);
        Assert.Null(control.AccessibleName);
        Assert.Null(control.ActiveControl);
        Assert.Equal(AccessibleRole.Default, control.AccessibleRole);
        Assert.False(control.AllowDrop);
        Assert.Equal(AnchorStyles.Top | AnchorStyles.Left, control.Anchor);
        Assert.False(control.AutoScroll);
        Assert.Equal(SizeF.Empty, control.AutoScaleDimensions);
        Assert.Equal(new SizeF(1, 1), control.AutoScaleFactor);
        Assert.Equal(Size.Empty, control.AutoScrollMargin);
        Assert.Equal(AutoScaleMode.Inherit, control.AutoScaleMode);
        Assert.Equal(Size.Empty, control.AutoScrollMinSize);
        Assert.Equal(Point.Empty, control.AutoScrollPosition);
        Assert.False(control.AutoSize);
        Assert.Equal(Control.DefaultBackColor, control.BackColor);
        Assert.Null(control.BackgroundImage);
        Assert.Equal(ImageLayout.Tile, control.BackgroundImageLayout);
        Assert.NotNull(control.BindingContext);
        Assert.Same(control.BindingContext, control.BindingContext);
        Assert.Equal(150, control.Bottom);
        Assert.Equal(new Rectangle(0, 0, 150, 150), control.Bounds);
        Assert.False(control.CanEnableIme);
        Assert.False(control.CanFocus);
        Assert.True(control.CanRaiseEvents);
        Assert.True(control.CanSelect);
        Assert.False(control.Capture);
        Assert.True(control.CausesValidation);
        Assert.Equal(new Rectangle(0, 0, 150, 150), control.ClientRectangle);
        Assert.Equal(new Size(150, 150), control.ClientSize);
        Assert.Null(control.Container);
        Assert.False(control.ContainsFocus);
        Assert.Null(control.ContextMenuStrip);
        Assert.Empty(control.Controls);
        Assert.Same(control.Controls, control.Controls);
        Assert.False(control.Created);
        Assert.Equal(SizeF.Empty, control.CurrentAutoScaleDimensions);
        Assert.Equal(Cursors.Default, control.Cursor);
        Assert.Equal(Cursors.Default, control.DefaultCursor);
        Assert.Equal(ImeMode.Inherit, control.DefaultImeMode);
        Assert.Equal(new Padding(3), control.DefaultMargin);
        Assert.Equal(Size.Empty, control.DefaultMaximumSize);
        Assert.Equal(Size.Empty, control.DefaultMinimumSize);
        Assert.Equal(Padding.Empty, control.DefaultPadding);
        Assert.Equal(new Size(150, 150), control.DefaultSize);
        Assert.False(control.DesignMode);
        Assert.Equal(new Rectangle(0, 0, 150, 150), control.DisplayRectangle);
        Assert.Equal(DockStyle.None, control.Dock);
        Assert.NotNull(control.DockPadding);
        Assert.Same(control.DockPadding, control.DockPadding);
        Assert.Equal(0, control.DockPadding.Top);
        Assert.Equal(0, control.DockPadding.Bottom);
        Assert.Equal(0, control.DockPadding.Left);
        Assert.Equal(0, control.DockPadding.Right);
        Assert.False(control.DoubleBuffered);
        Assert.True(control.Enabled);
        Assert.NotNull(control.Events);
        Assert.Same(control.Events, control.Events);
        Assert.False(control.Focused);
        Assert.Equal(Control.DefaultFont, control.Font);
        Assert.Equal(control.Font.Height, control.FontHeight);
        Assert.Equal(Control.DefaultForeColor, control.ForeColor);
        Assert.False(control.HasChildren);
        Assert.Equal(150, control.Height);
        Assert.NotNull(control.HorizontalScroll);
        Assert.Same(control.HorizontalScroll, control.HorizontalScroll);
        Assert.False(control.HScroll);
        Assert.Equal(ImeMode.NoControl, control.ImeMode);
        Assert.Equal(ImeMode.NoControl, control.ImeModeBase);
        Assert.False(control.IsAccessible);
        Assert.False(control.IsMirrored);
        Assert.NotNull(control.LayoutEngine);
        Assert.Same(control.LayoutEngine, control.LayoutEngine);
        Assert.Equal(0, control.Left);
        Assert.Equal(Point.Empty, control.Location);
        Assert.Equal(new Padding(3), control.Margin);
        Assert.Equal(Size.Empty, control.MaximumSize);
        Assert.Equal(Size.Empty, control.MinimumSize);
        Assert.Equal(Padding.Empty, control.Padding);
        Assert.Null(control.Parent);
        Assert.Equal(Size.Empty, control.PreferredSize);
        Assert.Equal("Microsoft\u00AE .NET", control.ProductName);
        Assert.False(control.RecreatingHandle);
        Assert.Null(control.Region);
        Assert.False(control.ResizeRedraw);
        Assert.Equal(150, control.Right);
        Assert.Equal(RightToLeft.No, control.RightToLeft);
        Assert.True(control.ShowFocusCues);
        Assert.True(control.ShowKeyboardCues);
        Assert.Null(control.Site);
        Assert.Equal(new Size(150, 150), control.Size);
        Assert.Equal(0, control.TabIndex);
        Assert.True(control.TabStop);
        Assert.Empty(control.Text);
        Assert.Equal(0, control.Top);
        Assert.Null(control.TopLevelControl);
        Assert.False(control.UseWaitCursor);
        Assert.True(control.Visible);
        Assert.NotNull(control.VerticalScroll);
        Assert.Same(control.VerticalScroll, control.VerticalScroll);
        Assert.False(control.VScroll);
        Assert.Equal(150, control.Width);

        Assert.False(control.IsHandleCreated);
    }

    [WinFormsFact]
    public void UserControl_CreateParams_GetDefault_ReturnsExpected()
    {
        using SubUserControl control = new();
        CreateParams createParams = control.CreateParams;
        Assert.Null(createParams.Caption);
        Assert.Null(createParams.ClassName);
        Assert.Equal(0x8, createParams.ClassStyle);
        Assert.Equal(0x10000, createParams.ExStyle);
        Assert.Equal(150, createParams.Height);
        Assert.Equal(IntPtr.Zero, createParams.Parent);
        Assert.Null(createParams.Param);
        Assert.Equal(0x56010000, createParams.Style);
        Assert.Equal(150, createParams.Width);
        Assert.Equal(0, createParams.X);
        Assert.Equal(0, createParams.Y);
        Assert.Same(createParams, control.CreateParams);
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsTheory]
    [InlineData(BorderStyle.None, 0x56010000, 0x10000)]
    [InlineData(BorderStyle.Fixed3D, 0x56010000, 0x10200)]
    [InlineData(BorderStyle.FixedSingle, 0x56810000, 0x10000)]
    public void UserControl_CreateParams_GetBorderStyle_ReturnsExpected(BorderStyle borderStyle, int expectedStyle, int expectedExStyle)
    {
        using SubUserControl control = new()
        {
            BorderStyle = borderStyle
        };
        CreateParams createParams = control.CreateParams;
        Assert.Null(createParams.Caption);
        Assert.Null(createParams.ClassName);
        Assert.Equal(0x8, createParams.ClassStyle);
        Assert.Equal(expectedExStyle, createParams.ExStyle);
        Assert.Equal(150, createParams.Height);
        Assert.Equal(IntPtr.Zero, createParams.Parent);
        Assert.Null(createParams.Param);
        Assert.Equal(expectedStyle, createParams.Style);
        Assert.Equal(150, createParams.Width);
        Assert.Equal(0, createParams.X);
        Assert.Equal(0, createParams.Y);
        Assert.Same(createParams, control.CreateParams);
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsTheory]
    [BoolData]
    public void UserControl_AutoSize_Set_GetReturnsExpected(bool value)
    {
        using UserControl control = new();
        int layoutCallCount = 0;
        control.Layout += (sender, e) => layoutCallCount++;

        control.AutoSize = value;
        Assert.Equal(value, control.AutoSize);
        Assert.Equal(0, layoutCallCount);
        Assert.False(control.IsHandleCreated);

        // Set same.
        control.AutoSize = value;
        Assert.Equal(value, control.AutoSize);
        Assert.Equal(0, layoutCallCount);
        Assert.False(control.IsHandleCreated);

        // Set different.
        control.AutoSize = !value;
        Assert.Equal(!value, control.AutoSize);
        Assert.Equal(0, layoutCallCount);
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsFact]
    public void UserControl_AutoSize_SetWithHandler_CallsAutoSizeChanged()
    {
        using UserControl control = new()
        {
            AutoSize = true
        };
        int callCount = 0;
        EventHandler handler = (sender, e) =>
        {
            Assert.Same(control, sender);
            Assert.Same(EventArgs.Empty, e);
            callCount++;
        };
        control.AutoSizeChanged += handler;

        // Set different.
        control.AutoSize = false;
        Assert.False(control.AutoSize);
        Assert.Equal(1, callCount);

        // Set same.
        control.AutoSize = false;
        Assert.False(control.AutoSize);
        Assert.Equal(1, callCount);

        // Set different.
        control.AutoSize = true;
        Assert.True(control.AutoSize);
        Assert.Equal(2, callCount);

        // Remove handler.
        control.AutoSizeChanged -= handler;
        control.AutoSize = false;
        Assert.False(control.AutoSize);
        Assert.Equal(2, callCount);
    }

    [WinFormsTheory]
    [InlineData(AutoSizeMode.GrowAndShrink, 1)]
    [InlineData(AutoSizeMode.GrowOnly, 0)]
    public void UserControl_AutoSizeMode_Set_GetReturnsExpected(AutoSizeMode value, int expectedLayoutCallCount)
    {
        using SubUserControl control = new();
        int layoutCallCount = 0;
        control.Layout += (sender, e) =>
        {
            Assert.Same(control, sender);
            Assert.Same(control, e.AffectedControl);
            Assert.Equal("AutoSize", e.AffectedProperty);
            layoutCallCount++;
        };

        control.AutoSizeMode = value;
        Assert.Equal(value, control.AutoSizeMode);
        Assert.Equal(value, control.GetAutoSizeMode());
        Assert.False(control.IsHandleCreated);
        Assert.Equal(expectedLayoutCallCount, layoutCallCount);

        // Set same.
        control.AutoSizeMode = value;
        Assert.Equal(value, control.AutoSizeMode);
        Assert.Equal(value, control.GetAutoSizeMode());
        Assert.False(control.IsHandleCreated);
        Assert.Equal(expectedLayoutCallCount, layoutCallCount);
    }

    [WinFormsTheory]
    [InlineData(AutoSizeMode.GrowAndShrink, 1)]
    [InlineData(AutoSizeMode.GrowOnly, 0)]
    public void UserControl_AutoSizeMode_SetDesignMode_GetReturnsExpected(AutoSizeMode value, int expectedLayoutCallCount)
    {
        Mock<ISite> mockSite = new(MockBehavior.Strict);
        mockSite
            .Setup(s => s.GetService(typeof(AmbientProperties)))
            .Returns(new AmbientProperties());
        mockSite
            .Setup(s => s.DesignMode)
            .Returns(true);
        mockSite
            .Setup(s => s.Container)
            .Returns((IContainer)null);
        using SubUserControl control = new()
        {
            Site = mockSite.Object
        };
        int layoutCallCount = 0;
        control.Layout += (sender, e) =>
        {
            Assert.Same(control, sender);
            Assert.Same(control, e.AffectedControl);
            Assert.Equal("AutoSize", e.AffectedProperty);
            layoutCallCount++;
        };

        control.AutoSizeMode = value;
        Assert.Equal(value, control.AutoSizeMode);
        Assert.Equal(value, control.GetAutoSizeMode());
        Assert.False(control.IsHandleCreated);
        Assert.Equal(expectedLayoutCallCount, layoutCallCount);

        // Set same.
        control.AutoSizeMode = value;
        Assert.Equal(value, control.AutoSizeMode);
        Assert.Equal(value, control.GetAutoSizeMode());
        Assert.False(control.IsHandleCreated);
        Assert.Equal(expectedLayoutCallCount, layoutCallCount);
    }

    [WinFormsTheory]
    [InlineData(AutoSizeMode.GrowAndShrink, 1)]
    [InlineData(AutoSizeMode.GrowOnly, 0)]
    public void UserControl_AutoSizeMode_SetWithParent_GetReturnsExpected(AutoSizeMode value, int expectedLayoutCallCount)
    {
        using Control parent = new();
        using SubUserControl control = new()
        {
            Parent = parent
        };
        int layoutCallCount = 0;
        control.Layout += (sender, e) => layoutCallCount++;
        int parentLayoutCallCount = 0;
        void parentHandler(object sender, LayoutEventArgs e)
        {
            Assert.Same(parent, sender);
            Assert.Same(control, e.AffectedControl);
            Assert.Equal("AutoSize", e.AffectedProperty);
            parentLayoutCallCount++;
        }

        parent.Layout += parentHandler;

        try
        {
            control.AutoSizeMode = value;
            Assert.Equal(value, control.AutoSizeMode);
            Assert.Equal(value, control.GetAutoSizeMode());
            Assert.False(control.IsHandleCreated);
            Assert.Equal(0, layoutCallCount);
            Assert.False(parent.IsHandleCreated);
            Assert.Equal(expectedLayoutCallCount, parentLayoutCallCount);

            // Set same.
            control.AutoSizeMode = value;
            Assert.Equal(value, control.AutoSizeMode);
            Assert.Equal(value, control.GetAutoSizeMode());
            Assert.False(control.IsHandleCreated);
            Assert.Equal(0, layoutCallCount);
            Assert.False(parent.IsHandleCreated);
            Assert.Equal(expectedLayoutCallCount, parentLayoutCallCount);
        }
        finally
        {
            parent.Layout -= parentHandler;
        }
    }

    [WinFormsTheory]
    [InlineData(AutoSizeMode.GrowAndShrink, 1)]
    [InlineData(AutoSizeMode.GrowOnly, 0)]
    public void UserControl_AutoSizeMode_SetDesignModeWithParent_GetReturnsExpected(AutoSizeMode value, int expectedLayoutCallCount)
    {
        using Control parent = new();
        Mock<ISite> mockSite = new(MockBehavior.Strict);
        mockSite
            .Setup(s => s.GetService(typeof(AmbientProperties)))
            .Returns(new AmbientProperties());
        mockSite
            .Setup(s => s.DesignMode)
            .Returns(true);
        mockSite
            .Setup(s => s.Container)
            .Returns((IContainer)null);
        using SubUserControl control = new()
        {
            Parent = parent,
            Site = mockSite.Object
        };
        int layoutCallCount = 0;
        control.Layout += (sender, e) =>
        {
            Assert.Same(control, sender);
            Assert.Same(control, e.AffectedControl);
            Assert.Equal("AutoSize", e.AffectedProperty);
            layoutCallCount++;
        };
        int parentLayoutCallCount = 0;
        void parentHandler(object sender, LayoutEventArgs e) => parentLayoutCallCount++;
        parent.Layout += parentHandler;

        try
        {
            control.AutoSizeMode = value;
            Assert.Equal(value, control.AutoSizeMode);
            Assert.Equal(value, control.GetAutoSizeMode());
            Assert.False(control.IsHandleCreated);
            Assert.Equal(expectedLayoutCallCount, layoutCallCount);
            Assert.False(parent.IsHandleCreated);
            Assert.Equal(0, parentLayoutCallCount);

            // Set same.
            control.AutoSizeMode = value;
            Assert.Equal(value, control.AutoSizeMode);
            Assert.Equal(value, control.GetAutoSizeMode());
            Assert.False(control.IsHandleCreated);
            Assert.Equal(expectedLayoutCallCount, layoutCallCount);
            Assert.False(parent.IsHandleCreated);
            Assert.Equal(0, parentLayoutCallCount);
        }
        finally
        {
            parent.Layout -= parentHandler;
        }
    }

    [WinFormsTheory]
    [InlineData(AutoSizeMode.GrowAndShrink, 1)]
    [InlineData(AutoSizeMode.GrowOnly, 0)]
    public void UserControl_AutoSizeMode_SetWithCustomLayoutEngineParent_GetReturnsExpected(AutoSizeMode value, int expectedLayoutCallCount)
    {
        using CustomLayoutEngineControl parent = new();
        using SubUserControl control = new()
        {
            Parent = parent
        };
        parent.SetLayoutEngine(new SubLayoutEngine());
        int layoutCallCount = 0;
        control.Layout += (sender, e) => layoutCallCount++;
        int parentLayoutCallCount = 0;
        void parentHandler(object sender, LayoutEventArgs e)
        {
            Assert.Same(parent, sender);
            Assert.Same(control, e.AffectedControl);
            Assert.Equal("AutoSize", e.AffectedProperty);
            parentLayoutCallCount++;
        }

        parent.Layout += parentHandler;
        try
        {
            control.AutoSizeMode = value;
            Assert.Equal(value, control.AutoSizeMode);
            Assert.Equal(value, control.GetAutoSizeMode());
            Assert.False(control.IsHandleCreated);
            Assert.Equal(0, layoutCallCount);
            Assert.False(parent.IsHandleCreated);
            Assert.Equal(expectedLayoutCallCount, parentLayoutCallCount);

            // Set same.
            control.AutoSizeMode = value;
            Assert.Equal(value, control.AutoSizeMode);
            Assert.Equal(value, control.GetAutoSizeMode());
            Assert.False(control.IsHandleCreated);
            Assert.Equal(0, layoutCallCount);
            Assert.False(parent.IsHandleCreated);
            Assert.Equal(expectedLayoutCallCount, parentLayoutCallCount);
        }
        finally
        {
            parent.Layout -= parentHandler;
        }
    }

    private class CustomLayoutEngineControl : Control
    {
        private LayoutEngine _layoutEngine;

        public CustomLayoutEngineControl()
        {
            _layoutEngine = new Control().LayoutEngine;
        }

        public void SetLayoutEngine(LayoutEngine layoutEngine)
        {
            _layoutEngine = layoutEngine;
        }

        public override LayoutEngine LayoutEngine => _layoutEngine;
    }

    private class SubLayoutEngine : LayoutEngine
    {
    }

    [WinFormsTheory]
    [EnumData<AutoSizeMode>]
    public void UserControl_AutoSizeMode_SetWithHandle_GetReturnsExpected(AutoSizeMode value)
    {
        using SubUserControl control = new();
        Assert.NotEqual(IntPtr.Zero, control.Handle);
        int invalidatedCallCount = 0;
        control.Invalidated += (sender, e) => invalidatedCallCount++;
        int styleChangedCallCount = 0;
        control.StyleChanged += (sender, e) => styleChangedCallCount++;
        int createdCallCount = 0;
        control.HandleCreated += (sender, e) => createdCallCount++;

        control.AutoSizeMode = value;
        Assert.Equal(value, control.AutoSizeMode);
        Assert.Equal(value, control.GetAutoSizeMode());
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);

        // Set same.
        control.AutoSizeMode = value;
        Assert.Equal(value, control.AutoSizeMode);
        Assert.Equal(value, control.GetAutoSizeMode());
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);
    }

    [WinFormsTheory]
    [InlineData(AutoSizeMode.GrowAndShrink, 1)]
    [InlineData(AutoSizeMode.GrowOnly, 0)]
    public void UserControl_AutoSizeMode_SetWithParentWithHandle_GetReturnsExpected(AutoSizeMode value, int expectedLayoutCallCount)
    {
        using Control parent = new();
        using SubUserControl control = new()
        {
            Parent = parent
        };
        int layoutCallCount = 0;
        control.Layout += (sender, e) => layoutCallCount++;
        int parentLayoutCallCount = 0;
        void parentHandler(object sender, LayoutEventArgs e)
        {
            Assert.Same(parent, sender);
            Assert.Same(control, e.AffectedControl);
            Assert.Equal("AutoSize", e.AffectedProperty);
            parentLayoutCallCount++;
        }

        parent.Layout += parentHandler;
        Assert.NotEqual(IntPtr.Zero, parent.Handle);
        int invalidatedCallCount = 0;
        control.Invalidated += (sender, e) => invalidatedCallCount++;
        int styleChangedCallCount = 0;
        control.StyleChanged += (sender, e) => styleChangedCallCount++;
        int createdCallCount = 0;
        control.HandleCreated += (sender, e) => createdCallCount++;
        int parentInvalidatedCallCount = 0;
        parent.Invalidated += (sender, e) => parentInvalidatedCallCount++;
        int parentStyleChangedCallCount = 0;
        parent.StyleChanged += (sender, e) => parentStyleChangedCallCount++;
        int parentCreatedCallCount = 0;
        parent.HandleCreated += (sender, e) => parentCreatedCallCount++;

        try
        {
            control.AutoSizeMode = value;
            Assert.Equal(value, control.AutoSizeMode);
            Assert.Equal(value, control.GetAutoSizeMode());
            Assert.Equal(0, layoutCallCount);
            Assert.Equal(expectedLayoutCallCount, parentLayoutCallCount);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);
            Assert.True(parent.IsHandleCreated);
            Assert.Equal(0, parentInvalidatedCallCount);
            Assert.Equal(0, parentStyleChangedCallCount);
            Assert.Equal(0, parentCreatedCallCount);

            // Set same.
            control.AutoSizeMode = value;
            Assert.Equal(value, control.AutoSizeMode);
            Assert.Equal(value, control.GetAutoSizeMode());
            Assert.Equal(0, layoutCallCount);
            Assert.Equal(expectedLayoutCallCount, parentLayoutCallCount);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);
            Assert.True(parent.IsHandleCreated);
            Assert.Equal(0, parentInvalidatedCallCount);
            Assert.Equal(0, parentStyleChangedCallCount);
            Assert.Equal(0, parentCreatedCallCount);
        }
        finally
        {
            parent.Layout -= parentHandler;
        }
    }

    [WinFormsTheory]
    [InlineData(AutoSizeMode.GrowAndShrink, 1)]
    [InlineData(AutoSizeMode.GrowOnly, 0)]
    public void UserControl_AutoSizeMode_SetWithCustomLayoutEngineParentWithHandle_GetReturnsExpected(AutoSizeMode value, int expectedLayoutCallCount)
    {
        using CustomLayoutEngineControl parent = new();
        using SubUserControl control = new()
        {
            Parent = parent
        };
        int layoutCallCount = 0;
        control.Layout += (sender, e) => layoutCallCount++;
        int parentLayoutCallCount = 0;
        void parentHandler(object sender, LayoutEventArgs e)
        {
            Assert.Same(parent, sender);
            Assert.Same(control, e.AffectedControl);
            Assert.Equal("AutoSize", e.AffectedProperty);
            parentLayoutCallCount++;
        }

        parent.Layout += parentHandler;
        Assert.NotEqual(IntPtr.Zero, parent.Handle);
        int invalidatedCallCount = 0;
        control.Invalidated += (sender, e) => invalidatedCallCount++;
        int styleChangedCallCount = 0;
        control.StyleChanged += (sender, e) => styleChangedCallCount++;
        int createdCallCount = 0;
        control.HandleCreated += (sender, e) => createdCallCount++;
        int parentInvalidatedCallCount = 0;
        parent.Invalidated += (sender, e) => parentInvalidatedCallCount++;
        int parentStyleChangedCallCount = 0;
        parent.StyleChanged += (sender, e) => parentStyleChangedCallCount++;
        int parentCreatedCallCount = 0;
        parent.HandleCreated += (sender, e) => parentCreatedCallCount++;

        try
        {
            control.AutoSizeMode = value;
            Assert.Equal(value, control.AutoSizeMode);
            Assert.Equal(value, control.GetAutoSizeMode());
            Assert.Equal(0, layoutCallCount);
            Assert.Equal(expectedLayoutCallCount, parentLayoutCallCount);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);
            Assert.True(parent.IsHandleCreated);
            Assert.Equal(0, parentInvalidatedCallCount);
            Assert.Equal(0, parentStyleChangedCallCount);
            Assert.Equal(0, parentCreatedCallCount);

            // Set same.
            control.AutoSizeMode = value;
            Assert.Equal(value, control.AutoSizeMode);
            Assert.Equal(value, control.GetAutoSizeMode());
            Assert.Equal(0, layoutCallCount);
            Assert.Equal(expectedLayoutCallCount, parentLayoutCallCount);
            Assert.True(control.IsHandleCreated);
            Assert.Equal(0, invalidatedCallCount);
            Assert.Equal(0, styleChangedCallCount);
            Assert.Equal(0, createdCallCount);
            Assert.True(parent.IsHandleCreated);
            Assert.Equal(0, parentInvalidatedCallCount);
            Assert.Equal(0, parentStyleChangedCallCount);
            Assert.Equal(0, parentCreatedCallCount);
        }
        finally
        {
            parent.Layout -= parentHandler;
        }
    }

    [WinFormsTheory]
    [InvalidEnumData<AutoSizeMode>]
    public void UserControl_AutoSizeMode_SetInvalid_ThrowsInvalidEnumArgumentException(AutoSizeMode value)
    {
        using UserControl control = new();
        Assert.Throws<InvalidEnumArgumentException>("value", () => control.AutoSizeMode = value);
    }

    public static IEnumerable<object[]> AutoValidate_Set_TestData()
    {
        yield return new object[] { AutoValidate.Disable, AutoValidate.Disable };
        yield return new object[] { AutoValidate.EnablePreventFocusChange, AutoValidate.EnablePreventFocusChange };
        yield return new object[] { AutoValidate.EnableAllowFocusChange, AutoValidate.EnableAllowFocusChange };
        yield return new object[] { AutoValidate.Inherit, AutoValidate.EnablePreventFocusChange };
    }

    [WinFormsTheory]
    [MemberData(nameof(AutoValidate_Set_TestData))]
    public void UserControl_AutoValidate_Set_GetReturnsExpected(AutoValidate value, AutoValidate expected)
    {
        using UserControl control = new()
        {
            AutoValidate = value
        };
        Assert.Equal(expected, control.AutoValidate);
        Assert.False(control.IsHandleCreated);

        // Set same.
        control.AutoValidate = value;
        Assert.Equal(expected, control.AutoValidate);
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsFact]
    public void UserControl_AutoValidate_SetWithHandler_CallsAutoValidateChanged()
    {
        using UserControl control = new();
        int callCount = 0;
        EventHandler handler = (sender, e) =>
        {
            Assert.Same(control, sender);
            Assert.Same(EventArgs.Empty, e);
            callCount++;
        };
        control.AutoValidateChanged += handler;

        // Set different.
        control.AutoValidate = AutoValidate.EnablePreventFocusChange;
        Assert.Equal(AutoValidate.EnablePreventFocusChange, control.AutoValidate);
        Assert.Equal(1, callCount);

        // Set same.
        control.AutoValidate = AutoValidate.EnablePreventFocusChange;
        Assert.Equal(AutoValidate.EnablePreventFocusChange, control.AutoValidate);
        Assert.Equal(1, callCount);

        // Set different.
        control.AutoValidate = AutoValidate.EnableAllowFocusChange;
        Assert.Equal(AutoValidate.EnableAllowFocusChange, control.AutoValidate);
        Assert.Equal(2, callCount);

        // Remove handler.
        control.AutoValidateChanged -= handler;
        control.AutoValidate = AutoValidate.Disable;
        Assert.False(control.AutoSize);
        Assert.Equal(2, callCount);
    }

    [WinFormsTheory]
    [InvalidEnumData<AutoValidate>]
    public void UserControl_AutoValidate_SetInvalidValue_ThrowsInvalidEnumArgumentException(AutoValidate value)
    {
        using UserControl control = new();
        Assert.Throws<InvalidEnumArgumentException>("value", () => control.AutoValidate = value);
    }

    [WinFormsTheory]
    [EnumData<BorderStyle>]
    public void UserControl_BorderStyle_Set_GetReturnsExpected(BorderStyle value)
    {
        using UserControl control = new()
        {
            BorderStyle = value
        };
        Assert.Equal(value, control.BorderStyle);
        Assert.False(control.IsHandleCreated);

        // Set same.
        control.BorderStyle = value;
        Assert.Equal(value, control.BorderStyle);
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsTheory]
    [InlineData(BorderStyle.Fixed3D, 1)]
    [InlineData(BorderStyle.FixedSingle, 1)]
    [InlineData(BorderStyle.None, 0)]
    public void UserControl_BorderStyle_SetWithHandle_GetReturnsExpected(BorderStyle value, int expectedInvalidatedCallCount)
    {
        using UserControl control = new();
        Assert.NotEqual(IntPtr.Zero, control.Handle);
        int invalidatedCallCount = 0;
        control.Invalidated += (sender, e) => invalidatedCallCount++;
        int styleChangedCallCount = 0;
        control.StyleChanged += (sender, e) => styleChangedCallCount++;
        int createdCallCount = 0;
        control.HandleCreated += (sender, e) => createdCallCount++;

        control.BorderStyle = value;
        Assert.Equal(value, control.BorderStyle);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(expectedInvalidatedCallCount, invalidatedCallCount);
        Assert.Equal(expectedInvalidatedCallCount, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);

        // Set same.
        control.BorderStyle = value;
        Assert.Equal(value, control.BorderStyle);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(expectedInvalidatedCallCount, invalidatedCallCount);
        Assert.Equal(expectedInvalidatedCallCount, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);
    }

    [WinFormsTheory]
    [InvalidEnumData<BorderStyle>]
    public void UserControl_BorderStyle_SetInvalid_ThrowsInvalidEnumArgumentException(BorderStyle value)
    {
        using UserControl control = new();
        Assert.Throws<InvalidEnumArgumentException>("value", () => control.BorderStyle = value);
    }

    [WinFormsTheory]
    [NormalizedStringData]
    public void UserControl_Text_Set_GetReturnsExpected(string value, string expected)
    {
        using UserControl control = new()
        {
            Text = value
        };
        Assert.Equal(expected, control.Text);
        Assert.False(control.IsHandleCreated);

        // Set same.
        control.Text = value;
        Assert.Equal(expected, control.Text);
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsTheory]
    [NormalizedStringData]
    public void UserControl_Text_SetWithHandle_GetReturnsExpected(string value, string expected)
    {
        using UserControl control = new();
        Assert.NotEqual(IntPtr.Zero, control.Handle);
        int invalidatedCallCount = 0;
        control.Invalidated += (sender, e) => invalidatedCallCount++;
        int styleChangedCallCount = 0;
        control.StyleChanged += (sender, e) => styleChangedCallCount++;
        int createdCallCount = 0;
        control.HandleCreated += (sender, e) => createdCallCount++;

        control.Text = value;
        Assert.Equal(expected, control.Text);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);

        // Set same.
        control.Text = value;
        Assert.Equal(expected, control.Text);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);
    }

    [WinFormsFact]
    public void UserControl_Text_SetWithHandler_CallsTextChanged()
    {
        using UserControl control = new();
        int callCount = 0;
        void handler(object sender, EventArgs e)
        {
            Assert.Same(control, sender);
            Assert.Equal(EventArgs.Empty, e);
            callCount++;
        }

        control.TextChanged += handler;

        // Set different.
        control.Text = "text";
        Assert.Equal("text", control.Text);
        Assert.Equal(1, callCount);

        // Set same.
        control.Text = "text";
        Assert.Equal("text", control.Text);
        Assert.Equal(1, callCount);

        // Set different.
        control.Text = null;
        Assert.Empty(control.Text);
        Assert.Equal(2, callCount);

        // Remove handler.
        control.TextChanged -= handler;
        control.Text = "text";
        Assert.Equal("text", control.Text);
        Assert.Equal(2, callCount);
    }

    [WinFormsFact]
    public void UserControl_GetAutoSizeMode_Invoke_ReturnsExpected()
    {
        using SubUserControl control = new();
        Assert.Equal(AutoSizeMode.GrowOnly, control.GetAutoSizeMode());
    }

    [WinFormsTheory]
    [InlineData(0, true)]
    [InlineData(SubUserControl.ScrollStateAutoScrolling, false)]
    [InlineData(SubUserControl.ScrollStateFullDrag, false)]
    [InlineData(SubUserControl.ScrollStateHScrollVisible, false)]
    [InlineData(SubUserControl.ScrollStateUserHasScrolled, false)]
    [InlineData(SubUserControl.ScrollStateVScrollVisible, false)]
    [InlineData(int.MaxValue, false)]
    [InlineData((-1), false)]
    public void UserControl_GetScrollState_Invoke_ReturnsExpected(int bit, bool expected)
    {
        using SubUserControl control = new();
        Assert.Equal(expected, control.GetScrollState(bit));
    }

    [WinFormsTheory]
    [InlineData(ControlStyles.ContainerControl, true)]
    [InlineData(ControlStyles.UserPaint, true)]
    [InlineData(ControlStyles.Opaque, false)]
    [InlineData(ControlStyles.ResizeRedraw, false)]
    [InlineData(ControlStyles.FixedWidth, false)]
    [InlineData(ControlStyles.FixedHeight, false)]
    [InlineData(ControlStyles.StandardClick, true)]
    [InlineData(ControlStyles.Selectable, true)]
    [InlineData(ControlStyles.UserMouse, false)]
    [InlineData(ControlStyles.SupportsTransparentBackColor, true)]
    [InlineData(ControlStyles.StandardDoubleClick, true)]
    [InlineData(ControlStyles.AllPaintingInWmPaint, false)]
    [InlineData(ControlStyles.CacheText, false)]
    [InlineData(ControlStyles.EnableNotifyMessage, false)]
    [InlineData(ControlStyles.DoubleBuffer, false)]
    [InlineData(ControlStyles.OptimizedDoubleBuffer, false)]
    [InlineData(ControlStyles.UseTextForAccessibility, true)]
    [InlineData((ControlStyles)0, true)]
    [InlineData((ControlStyles)int.MaxValue, false)]
    [InlineData((ControlStyles)(-1), false)]
    public void UserControl_GetStyle_Invoke_ReturnsExpected(ControlStyles flag, bool expected)
    {
        using SubUserControl control = new();
        Assert.Equal(expected, control.GetStyle(flag));

        // Call again to test caching.
        Assert.Equal(expected, control.GetStyle(flag));
    }

    [WinFormsFact]
    public void UserControl_GetTopLevel_Invoke_ReturnsExpected()
    {
        using SubUserControl control = new();
        Assert.False(control.GetTopLevel());
    }

    [WinFormsFact]
    public void UserControl_OnCreateControl_Invoke_Nop()
    {
        using SubUserControl control = new();
        int bindingContextChangedCallCount = 0;
        int loadChangedCallCount = 0;
        control.BindingContextChanged += (sender, e) =>
        {
            Assert.Same(control, sender);
            Assert.Same(EventArgs.Empty, e);
            Assert.Equal(bindingContextChangedCallCount, loadChangedCallCount);
            bindingContextChangedCallCount++;
        };
        control.Load += (sender, e) =>
        {
            Assert.Same(control, sender);
            Assert.Same(EventArgs.Empty, e);
            Assert.Equal(bindingContextChangedCallCount - 1, loadChangedCallCount);
            loadChangedCallCount++;
        };
        control.OnCreateControl();
        Assert.False(control.Created);
        Assert.False(control.IsHandleCreated);
        Assert.Equal(1, bindingContextChangedCallCount);
        Assert.Equal(1, loadChangedCallCount);

        control.OnCreateControl();
        Assert.False(control.Created);
        Assert.False(control.IsHandleCreated);
        Assert.Equal(2, bindingContextChangedCallCount);
        Assert.Equal(2, loadChangedCallCount);
    }

    [WinFormsTheory]
    [NewAndDefaultData<EventArgs>]
    public void UserControl_OnLoad_Invoke_CallsLoad(EventArgs eventArgs)
    {
        using SubUserControl control = new();
        int callCount = 0;
        EventHandler handler = (sender, e) =>
        {
            Assert.Same(control, sender);
            Assert.Same(eventArgs, e);
            callCount++;
        };

        // Call with handler.
        control.Load += handler;
        control.OnLoad(eventArgs);
        Assert.Equal(1, callCount);

        // Remove handler.
        control.Load -= handler;
        control.OnLoad(eventArgs);
        Assert.Equal(1, callCount);
    }

    [WinFormsTheory]
    [CommonMemberData(typeof(CommonTestHelperEx), nameof(CommonTestHelperEx.GetMouseEventArgsTheoryData))]
    public void UserControl_OnMouseDown_Invoke_CallsMouseDown(MouseEventArgs eventArgs)
    {
        using SubUserControl control = new();
        int callCount = 0;
        MouseEventHandler handler = (sender, e) =>
        {
            Assert.Same(control, sender);
            Assert.Same(eventArgs, e);
            callCount++;
        };

        // Call with handler.
        control.MouseDown += handler;
        control.OnMouseDown(eventArgs);
        Assert.Equal(1, callCount);
        Assert.False(control.IsHandleCreated);

        // Remove handler.
        control.MouseDown -= handler;
        control.OnMouseDown(eventArgs);
        Assert.Equal(1, callCount);
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsTheory]
    [CommonMemberData(typeof(CommonTestHelperEx), nameof(CommonTestHelperEx.GetMouseEventArgsTheoryData))]
    public void UserControl_OnMouseDown_InvokeWithHandle_CallsMouseDown(MouseEventArgs eventArgs)
    {
        using SubUserControl control = new();
        Assert.NotEqual(IntPtr.Zero, control.Handle);
        int invalidatedCallCount = 0;
        control.Invalidated += (sender, e) => invalidatedCallCount++;
        int styleChangedCallCount = 0;
        control.StyleChanged += (sender, e) => styleChangedCallCount++;
        int createdCallCount = 0;
        control.HandleCreated += (sender, e) => createdCallCount++;
        int callCount = 0;
        MouseEventHandler handler = (sender, e) =>
        {
            Assert.Same(control, sender);
            Assert.Same(eventArgs, e);
            callCount++;
        };

        // Call with handler.
        control.MouseDown += handler;
        control.OnMouseDown(eventArgs);
        Assert.Equal(1, callCount);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);

        // Remove handler.
        control.MouseDown -= handler;
        control.OnMouseDown(eventArgs);
        Assert.Equal(1, callCount);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);
    }

    [WinFormsTheory]
    [NewAndDefaultData<EventArgs>]
    public void UserControl_OnResize_Invoke_CallsResize(EventArgs eventArgs)
    {
        using SubUserControl control = new();
        int callCount = 0;
        EventHandler handler = (sender, e) =>
        {
            Assert.Same(control, sender);
            Assert.Same(eventArgs, e);
            callCount++;
        };
        int layoutCallCount = 0;
        control.Layout += (sender, e) =>
        {
            Assert.Same(control, sender);
            Assert.Same(control, e.AffectedControl);
            Assert.Equal("Bounds", e.AffectedProperty);
            layoutCallCount++;
        };

        // Call with handler.
        control.Resize += handler;
        control.OnResize(eventArgs);
        Assert.Equal(1, callCount);
        Assert.Equal(1, layoutCallCount);
        Assert.False(control.IsHandleCreated);

        // Remove handler.
        control.Resize -= handler;
        control.OnResize(eventArgs);
        Assert.Equal(1, callCount);
        Assert.Equal(2, layoutCallCount);
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsTheory]
    [NewAndDefaultData<EventArgs>]
    public void UserControl_OnResize_InvokeWithBackgroundImage_CallsResize(EventArgs eventArgs)
    {
        using Bitmap backgroundImage = new(10, 10);
        using SubUserControl control = new()
        {
            BackgroundImage = backgroundImage
        };
        int callCount = 0;
        EventHandler handler = (sender, e) =>
        {
            Assert.Same(control, sender);
            Assert.Same(eventArgs, e);
            callCount++;
        };
        int layoutCallCount = 0;
        control.Layout += (sender, e) =>
        {
            Assert.Same(control, sender);
            Assert.Same(control, e.AffectedControl);
            Assert.Equal("Bounds", e.AffectedProperty);
            layoutCallCount++;
        };

        // Call with handler.
        control.Resize += handler;
        control.OnResize(eventArgs);
        Assert.Equal(1, callCount);
        Assert.Equal(1, layoutCallCount);
        Assert.False(control.IsHandleCreated);

        // Remove handler.
        control.Resize -= handler;
        control.OnResize(eventArgs);
        Assert.Equal(1, callCount);
        Assert.Equal(2, layoutCallCount);
        Assert.False(control.IsHandleCreated);
    }

    public static IEnumerable<object[]> OnResize_WithHandle_TestData()
    {
        yield return new object[] { true, null, 1 };
        yield return new object[] { true, new EventArgs(), 1 };
        yield return new object[] { false, null, 0 };
        yield return new object[] { false, new EventArgs(), 0 };
    }

    [WinFormsTheory]
    [MemberData(nameof(OnResize_WithHandle_TestData))]
    public void UserControl_OnResize_InvokeWithHandle_CallsResize(bool resizeRedraw, EventArgs eventArgs, int expectedInvalidatedCallCount)
    {
        using SubUserControl control = new();
        control.SetStyle(ControlStyles.ResizeRedraw, resizeRedraw);
        int callCount = 0;
        EventHandler handler = (sender, e) =>
        {
            Assert.Same(control, sender);
            Assert.Same(eventArgs, e);
            callCount++;
        };
        int layoutCallCount = 0;
        control.Layout += (sender, e) =>
        {
            Assert.Same(control, sender);
            Assert.Same(control, e.AffectedControl);
            Assert.Equal("Bounds", e.AffectedProperty);
            layoutCallCount++;
        };
        Assert.NotEqual(IntPtr.Zero, control.Handle);
        int invalidatedCallCount = 0;
        control.Invalidated += (sender, e) => invalidatedCallCount++;
        int styleChangedCallCount = 0;
        control.StyleChanged += (sender, e) => styleChangedCallCount++;
        int createdCallCount = 0;
        control.HandleCreated += (sender, e) => createdCallCount++;

        // Call with handler.
        control.Resize += handler;
        control.OnResize(eventArgs);
        Assert.Equal(1, callCount);
        Assert.Equal(1, layoutCallCount);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(expectedInvalidatedCallCount, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);

        // Remove handler.
        control.Resize -= handler;
        control.OnResize(eventArgs);
        Assert.Equal(1, callCount);
        Assert.Equal(2, layoutCallCount);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(expectedInvalidatedCallCount * 2, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);
    }

    [WinFormsTheory]
    [MemberData(nameof(OnResize_WithHandle_TestData))]
    public void UserControl_OnResize_InvokeWithBackgroundImageWithHandle_CallsResize(bool resizeRedraw, EventArgs eventArgs, int expectedInvalidatedCallCount)
    {
        using Bitmap backgroundImage = new(10, 10);
        using SubUserControl control = new()
        {
            BackgroundImage = backgroundImage
        };
        control.SetStyle(ControlStyles.ResizeRedraw, resizeRedraw);
        int callCount = 0;
        EventHandler handler = (sender, e) =>
        {
            Assert.Same(control, sender);
            Assert.Same(eventArgs, e);
            callCount++;
        };
        int layoutCallCount = 0;
        control.Layout += (sender, e) =>
        {
            Assert.Same(control, sender);
            Assert.Same(control, e.AffectedControl);
            Assert.Equal("Bounds", e.AffectedProperty);
            layoutCallCount++;
        };
        Assert.NotEqual(IntPtr.Zero, control.Handle);
        int invalidatedCallCount = 0;
        control.Invalidated += (sender, e) => invalidatedCallCount++;
        int styleChangedCallCount = 0;
        control.StyleChanged += (sender, e) => styleChangedCallCount++;
        int createdCallCount = 0;
        control.HandleCreated += (sender, e) => createdCallCount++;

        // Call with handler.
        control.Resize += handler;
        control.OnResize(eventArgs);
        Assert.Equal(1, callCount);
        Assert.Equal(1, layoutCallCount);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(expectedInvalidatedCallCount + 1, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);

        // Remove handler.
        control.Resize -= handler;
        control.OnResize(eventArgs);
        Assert.Equal(1, callCount);
        Assert.Equal(2, layoutCallCount);
        Assert.True(control.IsHandleCreated);
        Assert.Equal((expectedInvalidatedCallCount + 1) * 2, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);
    }

    [WinFormsFact]
    public void UserControl_ValidateChildren_InvokeWithoutChildren_ReturnsTrue()
    {
        using UserControl control = new();
        Assert.True(control.ValidateChildren());
    }

    public static IEnumerable<object[]> ValidateChildren_TestData()
    {
        yield return new object[] { true, 0 };
        yield return new object[] { false, 1 };
    }

    [WinFormsTheory]
    [MemberData(nameof(ValidateChildren_TestData))]
    public void UserControl_ValidateChildren_InvokeWithChildren_ReturnsExpected(bool cancel, int expectedCallCount)
    {
        using UserControl control = new();
        using Control child1 = new();
        using Control grandchild1 = new();
        child1.Controls.Add(grandchild1);
        using UserControl child2 = new();
        using Control grandchild2 = new();
        child2.Controls.Add(grandchild2);
        using TabControl child3 = new();
        using TabPage grandchild3 = new();
        child3.Controls.Add(grandchild3);
        using SubControl child4 = new();
        child4.SetStyle(ControlStyles.Selectable, false);
        using SubControl child5 = new()
        {
            Enabled = false
        };
        using SubControl child6 = new()
        {
            Visible = false
        };
        using SubControl child7 = new()
        {
            TabStop = false
        };
        using SubControl child8 = new()
        {
            CausesValidation = false
        };
        control.Controls.Add(child1);
        control.Controls.Add(child2);
        control.Controls.Add(child3);
        control.Controls.Add(child4);
        control.Controls.Add(child5);
        control.Controls.Add(child6);
        control.Controls.Add(child7);
        control.Controls.Add(child8);

        int validatingCallCount = 0;
        control.Validating += (sender, e) => validatingCallCount++;
        int validatedCallCount = 0;
        control.Validated += (sender, e) => validatedCallCount++;

        int child1ValidatingCallCount = 0;
        child1.Validating += (sender, e) =>
        {
            Assert.Same(child1, sender);
            Assert.False(e.Cancel);
            child1ValidatingCallCount++;
            e.Cancel = cancel;
        };
        int child1ValidatedCallCount = 0;
        child1.Validated += (sender, e) =>
        {
            Assert.Same(child1, sender);
            Assert.Same(EventArgs.Empty, e);
            child1ValidatedCallCount++;
        };
        int grandchild1ValidatingCallCount = 0;
        grandchild1.Validating += (sender, e) =>
        {
            Assert.Same(grandchild1, sender);
            Assert.False(e.Cancel);
            grandchild1ValidatingCallCount++;
        };
        int grandchild1ValidatedCallCount = 0;
        grandchild1.Validated += (sender, e) => grandchild1ValidatedCallCount++;
        int child2ValidatingCallCount = 0;
        child2.Validating += (sender, e) =>
        {
            Assert.Same(child2, sender);
            Assert.False(e.Cancel);
            child2ValidatingCallCount++;
        };
        int child2ValidatedCallCount = 0;
        child2.Validated += (sender, e) =>
        {
            Assert.Same(child2, sender);
            Assert.Same(EventArgs.Empty, e);
            child2ValidatedCallCount++;
        };
        int grandchild2ValidatingCallCount = 0;
        grandchild2.Validating += (sender, e) =>
        {
            Assert.Same(grandchild2, sender);
            Assert.False(e.Cancel);
            grandchild2ValidatingCallCount++;
        };
        int grandchild2ValidatedCallCount = 0;
        grandchild2.Validated += (sender, e) =>
        {
            Assert.Same(grandchild2, sender);
            Assert.Same(EventArgs.Empty, e);
            grandchild2ValidatedCallCount++;
        };
        int child3ValidatingCallCount = 0;
        child3.Validating += (sender, e) =>
        {
            Assert.Same(child3, sender);
            Assert.False(e.Cancel);
            child3ValidatingCallCount++;
        };
        int child3ValidatedCallCount = 0;
        child3.Validated += (sender, e) =>
        {
            Assert.Same(child3, sender);
            Assert.Same(EventArgs.Empty, e);
            child3ValidatedCallCount++;
        };
        int grandchild3ValidatingCallCount = 0;
        grandchild3.Validating += (sender, e) => grandchild3ValidatingCallCount++;
        int grandchild3ValidatedCallCount = 0;
        grandchild3.Validated += (sender, e) => grandchild3ValidatedCallCount++;
        int child4ValidatingCallCount = 0;
        child4.Validating += (sender, e) => child4ValidatingCallCount++;
        int child4ValidatedCallCount = 0;
        child4.Validated += (sender, e) => child4ValidatedCallCount++;
        int child5ValidatingCallCount = 0;
        child5.Validating += (sender, e) =>
        {
            Assert.Same(child5, sender);
            Assert.False(e.Cancel);
            child5ValidatingCallCount++;
        };
        int child5ValidatedCallCount = 0;
        child5.Validated += (sender, e) =>
        {
            Assert.Same(child5, sender);
            Assert.Same(EventArgs.Empty, e);
            child5ValidatedCallCount++;
        };
        int child6ValidatingCallCount = 0;
        child6.Validating += (sender, e) =>
        {
            Assert.Same(child6, sender);
            Assert.False(e.Cancel);
            child6ValidatingCallCount++;
        };
        int child6ValidatedCallCount = 0;
        child6.Validated += (sender, e) =>
        {
            Assert.Same(child6, sender);
            Assert.Same(EventArgs.Empty, e);
            child6ValidatedCallCount++;
        };
        int child7ValidatingCallCount = 0;
        child7.Validating += (sender, e) =>
        {
            Assert.Same(child7, sender);
            Assert.False(e.Cancel);
            child7ValidatingCallCount++;
        };
        int child7ValidatedCallCount = 0;
        child7.Validated += (sender, e) =>
        {
            Assert.Same(child7, sender);
            Assert.Same(EventArgs.Empty, e);
            child7ValidatedCallCount++;
        };
        int child8ValidatingCallCount = 0;
        child8.Validating += (sender, e) => child8ValidatingCallCount++;
        int child8ValidatedCallCount = 0;
        child8.Validated += (sender, e) => child8ValidatedCallCount++;

        Assert.Equal(!cancel, control.ValidateChildren());
        Assert.Equal(0, validatingCallCount);
        Assert.Equal(0, validatedCallCount);
        Assert.Equal(1, child1ValidatingCallCount);
        Assert.Equal(expectedCallCount, child1ValidatedCallCount);
        Assert.Equal(0, grandchild1ValidatingCallCount);
        Assert.Equal(0, grandchild1ValidatedCallCount);
        Assert.Equal(1, child2ValidatingCallCount);
        Assert.Equal(1, child2ValidatedCallCount);
        Assert.Equal(1, grandchild2ValidatingCallCount);
        Assert.Equal(1, grandchild2ValidatedCallCount);
        Assert.Equal(1, child3ValidatingCallCount);
        Assert.Equal(1, child3ValidatedCallCount);
        Assert.Equal(0, grandchild3ValidatingCallCount);
        Assert.Equal(0, grandchild3ValidatedCallCount);
        Assert.Equal(0, child4ValidatingCallCount);
        Assert.Equal(0, child4ValidatedCallCount);
        Assert.Equal(1, child5ValidatingCallCount);
        Assert.Equal(1, child5ValidatedCallCount);
        Assert.Equal(1, child6ValidatingCallCount);
        Assert.Equal(1, child6ValidatedCallCount);
        Assert.Equal(1, child7ValidatingCallCount);
        Assert.Equal(1, child7ValidatedCallCount);
        Assert.Equal(0, child8ValidatingCallCount);
        Assert.Equal(0, child8ValidatedCallCount);
    }

    [WinFormsTheory]
    [EnumData<ValidationConstraints>]
    public void UserControl_ValidateChildren_InvokeValidationConstraintsWithoutChildren_ReturnsTrue(ValidationConstraints validationConstraints)
    {
        using UserControl control = new();
        Assert.True(control.ValidateChildren(validationConstraints));
    }

    public static IEnumerable<object[]> ValidateChildren_ValidationConstraints_TestData()
    {
        yield return new object[] { ValidationConstraints.ImmediateChildren, true, 0, 0, 0, 1, 1, 1, 1 };
        yield return new object[] { ValidationConstraints.ImmediateChildren, false, 1, 0, 0, 1, 1, 1, 1 };

        yield return new object[] { ValidationConstraints.Selectable, true, 0, 1, 0, 0, 1, 1, 1 };
        yield return new object[] { ValidationConstraints.Selectable, false, 1, 1, 0, 0, 1, 1, 1 };

        yield return new object[] { ValidationConstraints.Enabled, true, 0, 1, 1, 1, 0, 1, 1 };
        yield return new object[] { ValidationConstraints.Enabled, false, 1, 1, 1, 1, 0, 1, 1 };

        yield return new object[] { ValidationConstraints.Visible, true, 0, 1, 0, 1, 1, 0, 1 };
        yield return new object[] { ValidationConstraints.Visible, false, 1, 1, 0, 1, 1, 0, 1 };

        yield return new object[] { ValidationConstraints.TabStop, true, 0, 1, 0, 1, 1, 1, 0 };
        yield return new object[] { ValidationConstraints.TabStop, false, 1, 1, 0, 1, 1, 1, 0 };

        yield return new object[] { ValidationConstraints.None, true, 0, 1, 1, 1, 1, 1, 1 };
        yield return new object[] { ValidationConstraints.None, false, 1, 1, 1, 1, 1, 1, 1 };

        yield return new object[] { ValidationConstraints.ImmediateChildren | ValidationConstraints.Selectable | ValidationConstraints.Enabled | ValidationConstraints.Visible | ValidationConstraints.TabStop, true, 0, 0, 0, 0, 0, 0, 0 };
        yield return new object[] { ValidationConstraints.ImmediateChildren | ValidationConstraints.Selectable | ValidationConstraints.Enabled | ValidationConstraints.Visible | ValidationConstraints.TabStop, false, 1, 0, 0, 0, 0, 0, 0 };
    }

    [WinFormsTheory]
    [MemberData(nameof(ValidateChildren_ValidationConstraints_TestData))]
    public void UserControl_ValidateChildren_InvokeValidationConstraintsWithChildren_ReturnsExpected(ValidationConstraints validationConstraints, bool cancel, int expectedChild1CallCount, int expectedGrandchild2CallCount, int expectedGrandchild3CallCount, int expectedChild4CallCount, int expectedChild5CallCount, int expectedChild6CallCount, int expectedChild7CallCount)
    {
        using UserControl control = new();
        using Control child1 = new();
        using Control grandchild1 = new();
        child1.Controls.Add(grandchild1);
        using UserControl child2 = new();
        using Control grandchild2 = new();
        child2.Controls.Add(grandchild2);
        using TabControl child3 = new();
        using TabPage grandchild3 = new();
        child3.Controls.Add(grandchild3);
        using SubControl child4 = new();
        child4.SetStyle(ControlStyles.Selectable, false);
        using SubControl child5 = new()
        {
            Enabled = false
        };
        using SubControl child6 = new()
        {
            Visible = false
        };
        using SubControl child7 = new()
        {
            TabStop = false
        };
        using SubControl child8 = new()
        {
            CausesValidation = false
        };
        control.Controls.Add(child1);
        control.Controls.Add(child2);
        control.Controls.Add(child3);
        control.Controls.Add(child4);
        control.Controls.Add(child5);
        control.Controls.Add(child6);
        control.Controls.Add(child7);
        control.Controls.Add(child8);

        int validatingCallCount = 0;
        control.Validating += (sender, e) => validatingCallCount++;
        int validatedCallCount = 0;
        control.Validated += (sender, e) => validatedCallCount++;

        int child1ValidatingCallCount = 0;
        child1.Validating += (sender, e) =>
        {
            Assert.Same(child1, sender);
            Assert.False(e.Cancel);
            child1ValidatingCallCount++;
            e.Cancel = cancel;
        };
        int child1ValidatedCallCount = 0;
        child1.Validated += (sender, e) =>
        {
            Assert.Same(child1, sender);
            Assert.Same(EventArgs.Empty, e);
            child1ValidatedCallCount++;
        };
        int grandchild1ValidatingCallCount = 0;
        grandchild1.Validating += (sender, e) =>
        {
            Assert.Same(grandchild1, sender);
            Assert.False(e.Cancel);
            grandchild1ValidatingCallCount++;
        };
        int grandchild1ValidatedCallCount = 0;
        grandchild1.Validated += (sender, e) => grandchild1ValidatedCallCount++;
        int child2ValidatingCallCount = 0;
        child2.Validating += (sender, e) =>
        {
            Assert.Same(child2, sender);
            Assert.False(e.Cancel);
            child2ValidatingCallCount++;
        };
        int child2ValidatedCallCount = 0;
        child2.Validated += (sender, e) =>
        {
            Assert.Same(child2, sender);
            Assert.Same(EventArgs.Empty, e);
            child2ValidatedCallCount++;
        };
        int grandchild2ValidatingCallCount = 0;
        grandchild2.Validating += (sender, e) =>
        {
            Assert.Same(grandchild2, sender);
            Assert.False(e.Cancel);
            grandchild2ValidatingCallCount++;
        };
        int grandchild2ValidatedCallCount = 0;
        grandchild2.Validated += (sender, e) =>
        {
            Assert.Same(grandchild2, sender);
            Assert.Same(EventArgs.Empty, e);
            grandchild2ValidatedCallCount++;
        };
        int child3ValidatingCallCount = 0;
        child3.Validating += (sender, e) =>
        {
            Assert.Same(child3, sender);
            Assert.False(e.Cancel);
            child3ValidatingCallCount++;
        };
        int child3ValidatedCallCount = 0;
        child3.Validated += (sender, e) =>
        {
            Assert.Same(child3, sender);
            Assert.Same(EventArgs.Empty, e);
            child3ValidatedCallCount++;
        };
        int grandchild3ValidatingCallCount = 0;
        grandchild3.Validating += (sender, e) => grandchild3ValidatingCallCount++;
        int grandchild3ValidatedCallCount = 0;
        grandchild3.Validated += (sender, e) => grandchild3ValidatedCallCount++;
        int child4ValidatingCallCount = 0;
        child4.Validating += (sender, e) => child4ValidatingCallCount++;
        int child4ValidatedCallCount = 0;
        child4.Validated += (sender, e) => child4ValidatedCallCount++;
        int child5ValidatingCallCount = 0;
        child5.Validating += (sender, e) =>
        {
            Assert.Same(child5, sender);
            Assert.False(e.Cancel);
            child5ValidatingCallCount++;
        };
        int child5ValidatedCallCount = 0;
        child5.Validated += (sender, e) =>
        {
            Assert.Same(child5, sender);
            Assert.Same(EventArgs.Empty, e);
            child5ValidatedCallCount++;
        };
        int child6ValidatingCallCount = 0;
        child6.Validating += (sender, e) =>
        {
            Assert.Same(child6, sender);
            Assert.False(e.Cancel);
            child6ValidatingCallCount++;
        };
        int child6ValidatedCallCount = 0;
        child6.Validated += (sender, e) =>
        {
            Assert.Same(child6, sender);
            Assert.Same(EventArgs.Empty, e);
            child6ValidatedCallCount++;
        };
        int child7ValidatingCallCount = 0;
        child7.Validating += (sender, e) =>
        {
            Assert.Same(child7, sender);
            Assert.False(e.Cancel);
            child7ValidatingCallCount++;
        };
        int child7ValidatedCallCount = 0;
        child7.Validated += (sender, e) =>
        {
            Assert.Same(child7, sender);
            Assert.Same(EventArgs.Empty, e);
            child7ValidatedCallCount++;
        };
        int child8ValidatingCallCount = 0;
        child8.Validating += (sender, e) => child8ValidatingCallCount++;
        int child8ValidatedCallCount = 0;
        child8.Validated += (sender, e) => child8ValidatedCallCount++;

        Assert.Equal(!cancel, control.ValidateChildren(validationConstraints));
        Assert.Equal(0, validatingCallCount);
        Assert.Equal(0, validatedCallCount);
        Assert.Equal(1, child1ValidatingCallCount);
        Assert.Equal(expectedChild1CallCount, child1ValidatedCallCount);
        Assert.Equal(0, grandchild1ValidatingCallCount);
        Assert.Equal(0, grandchild1ValidatedCallCount);
        Assert.Equal(1, child2ValidatingCallCount);
        Assert.Equal(1, child2ValidatedCallCount);
        Assert.Equal(expectedGrandchild2CallCount, grandchild2ValidatingCallCount);
        Assert.Equal(expectedGrandchild2CallCount, grandchild2ValidatedCallCount);
        Assert.Equal(1, child3ValidatingCallCount);
        Assert.Equal(1, child3ValidatedCallCount);
        Assert.Equal(expectedGrandchild3CallCount, grandchild3ValidatingCallCount);
        Assert.Equal(expectedGrandchild3CallCount, grandchild3ValidatedCallCount);
        Assert.Equal(expectedChild4CallCount, child4ValidatingCallCount);
        Assert.Equal(expectedChild4CallCount, child4ValidatedCallCount);
        Assert.Equal(expectedChild5CallCount, child5ValidatingCallCount);
        Assert.Equal(expectedChild5CallCount, child5ValidatedCallCount);
        Assert.Equal(expectedChild6CallCount, child6ValidatingCallCount);
        Assert.Equal(expectedChild6CallCount, child6ValidatedCallCount);
        Assert.Equal(expectedChild7CallCount, child7ValidatingCallCount);
        Assert.Equal(expectedChild7CallCount, child7ValidatedCallCount);
        Assert.Equal(0, child8ValidatingCallCount);
        Assert.Equal(0, child8ValidatedCallCount);
    }

    [WinFormsTheory]
    [InlineData((ValidationConstraints)(-1))]
    [InlineData((ValidationConstraints)(0x20))]
    public void UserControl_ValidateChildren_InvalidValidationConstraints_ThrowsInvalidEnumArgumentException(ValidationConstraints validationConstraints)
    {
        using UserControl control = new();
        Assert.Throws<InvalidEnumArgumentException>("validationConstraints", () => control.ValidateChildren(validationConstraints));
    }

    [WinFormsFact]
    public void UserControl_WndProc_InvokeMouseHoverWithHandle_Success()
    {
        using SubUserControl control = new();
        Assert.NotEqual(IntPtr.Zero, control.Handle);
        int invalidatedCallCount = 0;
        control.Invalidated += (sender, e) => invalidatedCallCount++;
        int styleChangedCallCount = 0;
        control.StyleChanged += (sender, e) => styleChangedCallCount++;
        int createdCallCount = 0;
        control.HandleCreated += (sender, e) => createdCallCount++;

        int callCount = 0;
        control.MouseHover += (sender, e) =>
        {
            Assert.Same(control, sender);
            Assert.Same(EventArgs.Empty, e);
            callCount++;
        };
        Message m = new()
        {
            Msg = (int)PInvokeCore.WM_MOUSEHOVER,
            Result = 250
        };
        control.WndProc(ref m);
        Assert.Equal(IntPtr.Zero, m.Result);
        Assert.Equal(1, callCount);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);
    }

    [WinFormsFact]
    public void UserControl_WndProc_InvokeSetFocusWithHandle_Success()
    {
        using Control child1 = new();
        using Control child2 = new();
        using SubUserControl control = new();
        control.Controls.Add(child1);
        control.Controls.Add(child2);
        Assert.NotEqual(IntPtr.Zero, control.Handle);
        int invalidatedCallCount = 0;
        control.Invalidated += (sender, e) => invalidatedCallCount++;
        int styleChangedCallCount = 0;
        control.StyleChanged += (sender, e) => styleChangedCallCount++;
        int createdCallCount = 0;
        control.HandleCreated += (sender, e) => createdCallCount++;

        Message m = new()
        {
            Msg = (int)PInvokeCore.WM_SETFOCUS,
            Result = 250
        };
        control.WndProc(ref m);
        Assert.Equal(250, m.Result);
        Assert.Same(child1, control.ActiveControl);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);
    }

    [WinFormsFact]
    public void UserControl_WndProc_InvokeSetFocusWithActiveControlWithHandle_Success()
    {
        using Control child1 = new();
        using Control child2 = new();
        using SubUserControl control = new();
        control.Controls.Add(child1);
        control.Controls.Add(child2);
        control.ActiveControl = child2;
        Assert.NotEqual(IntPtr.Zero, control.Handle);
        int invalidatedCallCount = 0;
        control.Invalidated += (sender, e) => invalidatedCallCount++;
        int styleChangedCallCount = 0;
        control.StyleChanged += (sender, e) => styleChangedCallCount++;
        int createdCallCount = 0;
        control.HandleCreated += (sender, e) => createdCallCount++;

        Message m = new()
        {
            Msg = (int)PInvokeCore.WM_SETFOCUS,
            Result = 250
        };
        control.WndProc(ref m);
        Assert.Equal(250, m.Result);
        Assert.Same(child2, control.ActiveControl);
        Assert.True(control.IsHandleCreated);
        Assert.Equal(0, invalidatedCallCount);
        Assert.Equal(0, styleChangedCallCount);
        Assert.Equal(0, createdCallCount);
    }

    private class SubControl : Control
    {
        public new void SetStyle(ControlStyles flag, bool value) => base.SetStyle(flag, value);
    }

    public class SubUserControl : UserControl
    {
        public new const int ScrollStateAutoScrolling = ScrollableControl.ScrollStateAutoScrolling;

        public new const int ScrollStateHScrollVisible = ScrollableControl.ScrollStateHScrollVisible;

        public new const int ScrollStateVScrollVisible = ScrollableControl.ScrollStateVScrollVisible;

        public new const int ScrollStateUserHasScrolled = ScrollableControl.ScrollStateUserHasScrolled;

        public new const int ScrollStateFullDrag = ScrollableControl.ScrollStateFullDrag;

        public new SizeF AutoScaleFactor => base.AutoScaleFactor;

        public new bool CanEnableIme => base.CanEnableIme;

        public new bool CanRaiseEvents => base.CanRaiseEvents;

        public new CreateParams CreateParams => base.CreateParams;

        public new Cursor DefaultCursor => base.DefaultCursor;

        public new ImeMode DefaultImeMode => base.DefaultImeMode;

        public new Padding DefaultMargin => base.DefaultMargin;

        public new Size DefaultMaximumSize => base.DefaultMaximumSize;

        public new Size DefaultMinimumSize => base.DefaultMinimumSize;

        public new Padding DefaultPadding => base.DefaultPadding;

        public new Size DefaultSize => base.DefaultSize;

        public new bool DesignMode => base.DesignMode;

        public new bool DoubleBuffered
        {
            get => base.DoubleBuffered;
            set => base.DoubleBuffered = value;
        }

        public new EventHandlerList Events => base.Events;

        public new int FontHeight
        {
            get => base.FontHeight;
            set => base.FontHeight = value;
        }

        public new ImeMode ImeModeBase
        {
            get => base.ImeModeBase;
            set => base.ImeModeBase = value;
        }

        public new bool ResizeRedraw
        {
            get => base.ResizeRedraw;
            set => base.ResizeRedraw = value;
        }

        public new bool ShowFocusCues => base.ShowFocusCues;

        public new bool ShowKeyboardCues => base.ShowKeyboardCues;

        public new bool HScroll
        {
            get => base.HScroll;
            set => base.HScroll = value;
        }

        public new bool VScroll
        {
            get => base.VScroll;
            set => base.VScroll = value;
        }

        public new AutoSizeMode GetAutoSizeMode() => base.GetAutoSizeMode();

        public new bool GetScrollState(int bit) => base.GetScrollState(bit);

        public new bool GetStyle(ControlStyles flag) => base.GetStyle(flag);

        public new bool GetTopLevel() => base.GetTopLevel();

        public new void OnCreateControl() => base.OnCreateControl();

        public new void OnLoad(EventArgs e) => base.OnLoad(e);

        public new void OnMouseDown(MouseEventArgs e) => base.OnMouseDown(e);

        public new void OnResize(EventArgs e) => base.OnResize(e);

        public new void SetStyle(ControlStyles flag, bool value) => base.SetStyle(flag, value);

        public new void WndProc(ref Message m) => base.WndProc(ref m);
    }
}
